Can I keep an open fire when my chimney is lined?

All stoves and open fires must have the right sized flue. With a flue that is too small the fire is likely to spill smoke and fumes into the room. With open fires, when they are lined, the flue is inevitably reduced in size and this can make an open fire unfeasible. With a tall, well configured, well insulated flue the flue area requirement can be as little as 10% of the fire opening. Otherwise, we suggest ensuring that the flue area is 15%  of the size of the fire opening.

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